Method to control a well

Abstract

A method of controlling a well comprising adding a scaling solution into a reservoir via the well which forms scale in pores or channels of the reservoir in order to inhibit fluid flow; then, deploying a fluid into the well to create a hydrostatic head extending for at least 50 m. In this way two independent barriers are provided to control the well. Intervention work may then be done on the well, involving removing the wellhead. Equipment can be deployed through the hydrostatic head without the requirement to set a plug.

Dependencies are inferred from the claim text.